"It was all right when I did it," I said, "but when you did it, it was wrong. As though--you were following a trail, but a tree had fallen down in the meantime, or some hedge grew up, and you insisted on continuing on anyway, instead of going around it--" "There are no hedges!" he roared. "It comes, I suppose," I said thoughtfully, speaking to the air, "of spending too much time alone indoors, and forgetting that living things don't always stay where you put them."